arm: add support for LZ4-compressed kernel
Integrates the LZ4 decompression code to the arm pre-boot code.

Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Yann Collet <yann.collet.73@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Modified by ASKP for 3.0.xx
Signed-off-by: Locasto <amperific@gmail.com>

Signed-off-by: Grarak <williye97@gmail.com>

Conflicts:
	arch/arm/boot/compressed/Makefile
	arch/arm/boot/compressed/decompress.c

Conflicts:
	arch/arm/boot/compressed/.gitignore
	arch/arm/boot/compressed/Makefile